Not all of them
Smaragdina has green body
Guitar smaragdina has green body
Imbellis has green/emerald scale with dark body sometimes light body
Siamorientalis has green/emerald scales full dark body
Splendens has red/orange body
Stiktos has a blue/green body
Mahachaiensis has green/blue scale with dark body
But not all of them always turn out having dark bodys

Not all of them
Smaragdina has green body
Guitar smaragdina has green body
Imbellis has green/emerald scale with dark body sometimes light body
Siamorientalis has green/emerald scales full dark body
Splendens has red/orange body
Stiktos has a blue/green body
Mahachaiensis has green/blue scale with dark body
But not all of them always turn out having dark bodys

A Wild Caught Splenden normally has a light red/orange body like the one in the video and in this picture
both fishes have same characteristics if you look for them
this was one of my previous wild caught splenden

But I am confused...The one in the picture looks dark red/brown to me :(

It varies remember not all fish is looks the same but colors should be very close some has lighter body some has darker body but as long as they have the same characteristics they are the same species get into wild betta you will surely learn more about wild bettas and should be able to tell species from species and pretty from non pretty.

A Wild Caught Splenden normally has a light red/orange body like the one in the video and in this picture
both fishes have same characteristics if you look for them
this was one of my previous wild caught splenden